US10746772B2 - Identification of cloud-to-ground lightning strokes with continuing current - Google Patents
Identification of cloud-to-ground lightning strokes with continuing current Download PDFInfo
- Publication number
- US10746772B2 US10746772B2 US15/848,674 US201715848674A US10746772B2 US 10746772 B2 US10746772 B2 US 10746772B2 US 201715848674 A US201715848674 A US 201715848674A US 10746772 B2 US10746772 B2 US 10746772B2
- Authority
- US
- United States
- Prior art keywords
- optical signals
- lightning
- space
- earth
- data
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active, expires
Links
- 208000025274 Lightning injury Diseases 0.000 title 1
- 230000003287 optical effect Effects 0.000 claims abstract description 183
- 238000001514 detection method Methods 0.000 claims abstract description 153
- 238000000034 method Methods 0.000 claims abstract description 53
- 230000007613 environmental effect Effects 0.000 claims abstract description 33
- 230000004044 response Effects 0.000 claims abstract description 7
- 238000004891 communication Methods 0.000 description 15
- 238000003860 storage Methods 0.000 description 12
- 230000000875 corresponding effect Effects 0.000 description 11
- 230000008569 process Effects 0.000 description 11
- 230000002596 correlated effect Effects 0.000 description 10
- 238000012545 processing Methods 0.000 description 10
- 238000004422 calculation algorithm Methods 0.000 description 8
- 230000008859 change Effects 0.000 description 6
- 230000005672 electromagnetic field Effects 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 230000015654 memory Effects 0.000 description 6
- 238000011160 research Methods 0.000 description 5
- 239000013078 crystal Substances 0.000 description 4
- 239000013526 supercooled liquid Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000001413 cellular effect Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000013507 mapping Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000003936 working memory Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000010267 cellular communication Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 238000001429 visible spectrum Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01W—METEOROLOGY
- G01W1/00—Meteorology
- G01W1/16—Measuring atmospheric potential differences, e.g. due to electrical charges in clouds
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01W—METEOROLOGY
- G01W1/00—Meteorology
- G01W1/02—Instruments for indicating weather conditions by measuring two or more variables, e.g. humidity, pressure, temperature, cloud cover or wind speed
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0807—Measuring electromagnetic field characteristics characterised by the application
- G01R29/0814—Field measurements related to measuring influence on or from apparatus, components or humans, e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning
- G01R29/0842—Measurements related to lightning, e.g. measuring electric disturbances, warning systems
Definitions
- Lightning pulses may be categorized as cloud-to-ground (CG) strokes or cloud pulses.
- CG strokes that include or are followed by CC are more likely to start fires and more likely to cause significant damage than strokes that do not include or are not followed by CC.
- CC cloud-to-ground
- a method to detect CG strokes that include or are followed by CC includes generating earth-based lightning data for one or more lightning pulses detected in an environmental space using multiple earth-based lightning detection sensors.
- the method may also include generating space-based lightning data for one or more optical signals detected in the environmental space using one or more space-based lightning detection sensors.
- the method may also include determining whether each of the lightning pulses is a CG stroke based on the earth-based lightning data.
- the method may also include, in response to determining that a given one of the lightning pulses is a CG stroke, determining whether the CG stroke includes or is followed by continuing current based on the space-based lightning data.
- a non-transitory computer-readable medium has computer-readable instructions stored thereon that are executable by a processor device to perform or control performance of operations.
- the operations may include generating earth-based lightning data for one or more lightning pulses detected in an environmental space using multiple earth-based lightning detection sensors.
- the operations may also include generating space-based lightning data for one or more optical signals detected in the environmental space using one or more space-based lightning detection sensors.
- the operations may also include determining whether each of the lightning pulses is a CG stroke based on the earth-based lightning data.
- the operations may also include, in response to determining that a given one of the lightning pulses is a CG stroke, determining whether the CG stroke includes or is followed by continuing current based on the space-based lightning data
- lightning detection system includes multiple earth-based lightning detection sensors and a processor device.
- the earth-based lightning detection sensors may be configured to detect one or more lightning pulses in an environmental space.
- the processor device may be communicatively coupled to the earth-based lightning detection sensors and to one or more space-based lightning detection sensors configured to detect one or more optical signals in the environmental space.
- the processor device is configured to perform or control performance of operations that may include generating earth-based lightning data for the one or more lightning pulses.
- the operations may also include generating space-based lightning data for the one or more optical signals.
- the operations may also include determining whether each of the lightning pulses is a CG stroke based on the earth-based lightning data.
- the operations may also include, in response to determining that a given one of the lightning pulses is a CG stroke, determining whether the CG stroke includes or is followed by continuing current based on the space-based lightning data.
- FIG. 1 is an example lightning detection system
- FIG. 2 is an example earth-based lightning detection sensor
- FIG. 3 is a flowchart of an example method to identify CG strokes that include or are followed by CC.
- FIG. 4 shows an example computational system
- Systems and methods are disclosed to detect CG strokes that include or are followed by CC. Such systems and methods may, in effect, combine optical data and/or other data from space-based lightning detection sensors with ground-based lightning detection observations of CG strokes to determine which CG strokes include or are followed by CC.
- CG strokes that are followed by CC produce radio frequency (RF) signals at the lower end of the ELF range.
- CG strokes that are followed by CC also produce light continuously as long as the CC flows.
- the U.S. launched the first geostationary satellite ever to include an optical lightning mapping instrument, known as the Geostationary Lightning Mapper (GLM), followed shortly after by a similar Chinese instrument called the Lightning Mapping Imager (LMI).
- LLMI Lightning Mapping Imager
- the E.U. has plans to put a similar instrument into geostationary orbit.
- Such space-based lightning detection sensors may provide continuous or nearly continuous observations of light emissions from lightning at time intervals on the order of a couple of milliseconds.
- the nearly continuous light emissions associated with CC may be, to some extent, distinguishable from the mostly impulsive light emissions from CG strokes that do not produce CC, as well as from other in-cloud lightning processes.
- Space-based lightning detection sensors such as GLM, however, may be unable to provide better than about 8-10 kilometer (km) spatial resolution, and thus, the exact location of any given CG stroke is typically not discernible with such instruments. Space-based lightning detection sensors also generally cannot differentiate between CG strokes and in-cloud lightning processes because they may observe diffused optical signals that pass through clouds.
- some LLS networks or other earth-based lightning detection systems may be capable of geolocating CG strokes to a spatial accuracy of approximately 100 meters, and can accurately differentiate between CG strokes and in-cloud lightning processes.
- the combination of highly precise CG stroke geolocation and accurate differentiation from in-cloud processes available from some earth-based lightning detection systems with extended optical signals detectable from space available from some space-based lightning detection systems as described herein may provide detailed stroke-level information about CC. Such information may then be highly useful in a variety of sectors, such as wildland firefighting, insurance claim investigation, and electric power and telecommunications utility applications.
- the “slow” electric field change observations are designed to look primarily at the electrostatic component of the field changes produced by lightning processes, but the electrostatic component of the field change attenuates very rapidly with distance.
- “slow E” change observations are only useful at distances shorter than about 20 km from the lightning. Neither high-speed video nor “slow E” change observations are suited to wide-area real-time detection of CG strokes that include or are followed by CC.
- the combination of continuous optical data from one or more satellite-borne sensors in geostationary orbit with high-precision ground-based identification and geolocation of CG strokes as described herein may be leveraged to identify CG strokes that include or are followed by CC over large areas and in real time.
- FIG. 1 is an example lightning detection system 100 (hereinafter “system 100 ”), arranged in accordance with at least one embodiment described herein.
- the system 100 may include one or more earth-based lightning detection sensors and one or more space-based lightning detection sensors.
- the system 100 may include multiple earth-based lightning detection sensors including a first earth-based lightning detection sensor 110 and a second earth-based lightning detection sensor (collectively referred to as earth-based lightning detection sensors).
- the system 100 may also include a space-based lightning detection sensor 105 . While two earth-based lightning detection sensors 110 and 115 and one space-based lightning detection sensor 105 are shown in FIG. 1 , more generally the system 100 may include at least two earth-based lightning detection sensors and at least one space-based lightning detection sensor.
- the system 100 may include three or more earth-based lightning detection sensors and/or two or more space-based lightning detection sensors.
- the system 100 may also include a network 135 , a server 120 , one or more user interface devices 125 , and/or one or more cloud characteristic sensors 140 . Although illustrated as discrete blocks, various blocks may be divided into additional blocks, combined into fewer blocks, or eliminated, depending on the desired implementation.
- Each of the earth-based lightning detection sensors 110 and/or 115 may include any type of earth-based lightning detection sensor such as, for example, a VAISALA LS7002 lightning detection sensor or other suitable lightning detection sensor.
- one or more of the earth-based lightning detection sensors 110 and/or 115 may include the earth-based lightning detection sensor 200 of FIG. 2 .
- one or more of the earth-based lightning detection sensors 110 and/or 115 may include one or more components of the earth-based lightning detection sensor 200 of FIG. 2 .
- the earth-based lightning detection sensors 110 and/or 115 may be distributed throughout an environmental space to generate earth-based lightning data about one or more lightning sources 130 within the environmental space.
- the earth-based lightning detection sensors 110 and/or 115 may generate the earth-based lightning data about the lightning source 130 by detecting lightning pulses emitted by the lightning sources 130 within the environmental space.
- a single lightning source 130 is depicted in FIG. 1 for simplicity.
- the space-based lightning detection sensor 105 may include any type of space-based lightning detection sensor such as, for example, the Geostationary Lightning Mapper (GLM), any other optical sensor in geostationary orbit, or other suitable space-based lightning detection sensor.
- the space-based lightning detection sensor 105 may generate space-based lightning data about the lightning sources 130 within the environmental space.
- the space-based lightning detection sensor 105 may generate the space-based lightning data about the lightning source 130 by detecting optical signals emitted by the lightning sources 130 within the environmental space.
- Each lightning source 130 may include a discharge with movement of charge in the earth's atmosphere or between the atmosphere and earth, and which generates or emits electromagnetic field (EMF) emissions that may be detected by the earth-based lightning detection sensors 110 and 115 and/or the space-based lightning detection sensor 105 .
- the EMF emissions may include one or both of RF emissions and optical emissions.
- RF emissions may generally include EMF emissions with a frequency somewhere in a range from about 20 kilohertz (kHz) to about 300 gigahertz (GHz).
- RF emissions from a lightning source may be referred to as lightning pulses.
- Optical emissions may generally include EMF emissions in the near-infrared and/or visible spectrum (about 200-750 terahertz (THZ) or 400-1500 nanometers (nm)).
- the optical emissions detected by the space-based lightning detection sensor 105 may more particularly include EMF emissions with a wavelength of, e.g., 777.4 nm.
- the optical emissions detected by the space-based lightning detection sensor 105 may include other and/or additional wavelengths.
- Optical emissions from a lightning source may be referred to as optical signals.
- Each of the lightning sources 130 may include a cloud-to-ground (CG) lightning discharge, or an in-cloud (IC) lightning discharge.
- a CG lightning discharge may include an electrical discharge between a cloud and the ground.
- An IC lightning discharge may include an electrical discharge within a cloud, referred to as an intracloud lightning discharge, an electrical discharge between two clouds, referred to as a cloud-to-cloud lightning discharge, or an electrical discharge between a cloud and the air, referred to as a cloud-to-air lightning discharge.
- the lightning pulses emitted by CG lightning discharges may be referred to as CG return strokes, or simply CG strokes.
- the lightning pulses emitted by IC lightning discharges that do not reach ground may be referred to as cloud pulses.
- each lightning source 130 may emit a lightning pulse, multiple lightning pulses, an optical signal, multiple optical signals, and/or other lightning emissions that may be detected by the earth-based lightning detection sensors 110 and 115 and/or the space-based lightning detection sensor 105 .
- a lightning pulse may have a duration on the order of a few microseconds ( ⁇ s) or more, depending on how “pulse” is defined.
- the lightning pulses in the lightning data generated by the earth-based lightning detection sensors 110 and 115 may be grouped into lightning flashes using any suitable algorithm, such as the algorithm described in M. J. Murphy et al., Cloud Lightning Performance and Climatology of the U.S. Based on the Upgraded U.S. National Lightning Detection Network, Seventh Conf.
- a lightning flash may have a duration of, e.g., a hundred milliseconds (ms) or more and may be made up of multiple lightning pulses.
- the optical signals detected from space may be grouped into lightning flashes using any suitable algorithm, such as the algorithm described in D. Mach, et al., Performance assessment of the optical transient detector and lightning imaging sensor, Journal of Geophysical Research, (2007), which is herein incorporated by reference in its entirety.
- Lightning pulses may each have a type.
- the type of each lightning pulse may be a cloud pulse or a CG stroke. Any lightning pulse emitted by a lightning discharge that does not reach the ground may be categorized as a cloud pulse. Any lightning pulse emitted by a lightning discharge that reaches the ground may be categorized as a CG stroke.
- the type of each of the lightning pulses may be determined from the earth-based lightning data generated by the earth-based lightning detection sensors 110 and/or 115 responsive to detecting the lightning pulses. For instance, a shape of a plot of a time-varying voltage detected for a lightning pulse, or other information in or derived from earth-based lightning data generated for the lightning pulse, may be used to determine the type of each lightning pulse.
- CC may include an electrical current that flows from the cloud to the ground for a period of time due to the CG stroke. For example, CC may flow between the cloud and the ground for a period of time equal to or greater than 10 milliseconds (ms). Additionally or alternatively, CC that is included in or follows a return stroke may include low current values. In some embodiments, CC may include between ten and several hundred amperes. Furthermore, CC may flow for ten to several hundred milliseconds.
- Continuing current may remove charge from a region within the cloud, whereas return stroke current (e.g., the current that flows during the return stroke) may be impulsive, usually lasting less than three milliseconds, and may remove charge deposited by a preceding return stroke leader.
- return stroke current e.g., the current that flows during the return stroke
- Return stroke current typically poses less of a risk for damage through heating metal elements than continuing current.
- the energy delivered to a good conductor is proportional to the total charge transferred, which is typically higher in continuing currents than return stroke currents.
- return stroke current may transfer a charge comparable to a charge of continuing current. In the cases of strikes to metal, return stroke current with comparable charge transfer may still be less destructive than continuing currents, since the short durations limit the heat penetration. Nevertheless, a total charge transferred by a return stroke current may be a useful parameter in some scientific applications, including sprite production (Cummer, S. A., & Lyons, W. A. (2004). Lightning charge moment changes in US High Plains thunderstorms.
- the earth-based lightning detection sensors 110 and/or 115 may detect low frequency lightning pulses emitted by the lightning sources 130 .
- the earth-based lightning detection sensors 110 and/or 115 may detect the lightning pulses at frequencies between thirty kHz and three hundred kHz. Additionally or alternatively, the earth-based lightning detection sensors 110 and/or 115 may detect the lightning pulses at frequencies equal to or less than thirty kHz. Additionally or alternatively, the earth-based lightning detection sensors 110 and/or 115 may detect the lightning pulses at frequencies equal to or greater than three hundred kHz.
- one or more of the earth-based lightning detection sensors 110 and/or 115 may detect time domain, low frequency lightning pulses that may have (and/or whose data may have), for example, a specific shape, a specific time of arrival, and/or a specific direction of arrival from the one or more lightning sources 130 .
- the earth-based lightning detection sensors 110 and/or 115 may generate the earth-based lightning data for detected lightning pulses.
- the earth-based lightning data may include time-varying voltage or other time-varying measurements of the detected lightning pulses, times of occurrence of the lightning pulses, durations of the lightning pulses, the timing of when the lightning pulses are detected, the magnitude of the lightning pulses, the polarity of the lightning pulses, the type of lightning pulses, global positioning system (GPS) data associated with the earth-based lightning detection sensors 110 and/or 115 , angle or direction of arrival data, data from which one or more of the foregoing may be determined or derived, or other earth-based lightning data.
- GPS global positioning system
- the earth-based lightning detection sensors 110 and/or 115 may include a camera configured to capture video data of detected lightning pulses.
- locations of detected lightning pulses included in or derived from the earth-based lightning data may have a spatial resolution of about 100 meters, or more or less than 100 meters.
- the earth-based lightning detection sensors 110 and/or 115 may detect lightning sources 130 and/or lightning pulses emitted by the lightning sources 130 at long ranges such as, for example, ranges greater than 500 km, 1000 km, 1500 km, 1750 km, etc.
- the space-based lightning detection sensor 105 may detect the lightning sources 130 and/or optical signals emitted by the lightning sources 130 and received by the space-based lightning detection sensor 105 . Specifically, in some embodiments, the space-based lightning detection sensor 105 may measure the optical signals from lightning sources 130 by looking down at cloud tops. The optical signals may contain no information that can be used to discern the lightning type or polarity on a pulse-by-pulse basis. In these and other embodiments, the space-based lightning detection sensor 105 may generate the space-based lightning data for detected optical signals.
- the space-based lightning data may include, times of occurrence of the optical signals, locations of the optical signals, durations of the optical signals, timing of when the optical signals are detected, intensity of the light emitted by the detected optical signals, the areal extent of the detected optical signals, data from which one or more of the foregoing may be determined or derived, grouping according to optical signals, or other space-based lightning data.
- the space-based lightning data may include geolocation data for detected optical signals (or more particularly their location of origin), or geolocation data for detected optical signals may be derived from the space-based lightning data.
- locations of detected optical signals included in or derived from the space-based lightning data may have a spatial resolution of about 8-10 km, or more than 10 km or less than 8 km.
- the earth-based lightning detection sensors 110 and/or 115 may provide geolocation capabilities to the server 120 via the network 135 that specify the geolocation of the respective earth-based lightning detection sensors 110 or 115 .
- the network 135 may connect the earth-based lightning detection sensors 110 and/or 115 and/or the space-based lightning detection sensor 105 to the server 120 .
- the network 135 may be a wireless network that includes one or more wireless networks, such as, for example a wireless local area network (LAN), a cellular network, a long-term evolution (LTE) network, a code division multiple access (CDMA) network, a global system for mobile communication (GSM) network, a microwave network, a long range Wi-Fi network, a satellite network, or other suitable network.
- LAN wireless local area network
- LTE long-term evolution
- CDMA code division multiple access
- GSM global system for mobile communication
- microwave network a microwave network
- Wi-Fi Wireless Fidelity
- satellite network or other suitable network.
- the network 135 may include a wired LAN or Ethernet connection, or other wired connections for serial or parallel data transmission from the earth-based lightning detection sensors 110 and/or 115 to the server 120 .
- the network 135 may include both wireless and wired components.
- the space-based lightning detection sensor 105 and/or the cloud characteristic sensor 140 may be communicatively coupled to the network 135 via one or more wireless connections and the earth-based lightning detection sensors 110 and/or 115 and the server 120 may be communicatively coupled to the network 135 via one or more wired connections.
- the server 120 may include one or more components of computational system 400 of FIG. 4 . In some embodiments, the server 120 may include one or more servers located in one or more locations and/or located at various distributed locations (e.g., a cloud server).
- the server 120 may receive the earth-based lightning data from all or some of the earth-based lightning detection sensors 110 and/or 115 via the network 135 . In these and other embodiments, the server 120 may also receive the space-based lightning data from the space-based lightning detection sensor 105 via the network 135 . In some embodiments, the server 120 may also receive cloud characteristics data from the cloud characteristic sensor 140 via the network 135 . In some embodiments, the server 120 may include a database where the earth-based lightning data received from the earth-based lightning detection sensors 110 and/or 115 and the space-based lightning data received from the space-based lightning detection sensor 105 and/or the cloud characteristics data from cloud characteristic sensor 140 may be stored.
- the server 120 may include a processor (or one or more processors) programmed to process and/or analyze the earth-based lightning data received from the earth-based lightning detection sensors 110 and/or 115 , and/or the space-based lightning data received from the space-based lightning detection sensor 105 , and/or cloud characteristics data from the cloud characteristic sensor 140 , and/or stored in the database of the server 120 .
- a processor or one or more processors programmed to process and/or analyze the earth-based lightning data received from the earth-based lightning detection sensors 110 and/or 115 , and/or the space-based lightning data received from the space-based lightning detection sensor 105 , and/or cloud characteristics data from the cloud characteristic sensor 140 , and/or stored in the database of the server 120 .
- the server 120 may geolocate (e.g., determine a position of) the lightning sources 130 , or locations of origin of the corresponding lightning pulses, based on the earth-based lightning data received from the earth-based lightning detection sensors 110 and/or 115 .
- the server 120 may be configured to determine a position of the lightning sources 130 , e.g., using a time difference of arrival (TDOA) or triangulation method based on GPS or other position data and timing data included in the earth-based lightning data received from the earth-based lightning detection sensors 110 and/or 115 .
- TDOA time difference of arrival
- Such methods may consider the time of arrival of the same lightning pulse emitted by the lightning source 130 at the two (or more) earth-based lightning detection sensors 110 and/or 115 , locations, and/or angle/direction data.
- the server 120 may determine a time of occurrence of the lightning sources 130 , or times of occurrence of the corresponding lightning pulses and/or corresponding optical signals, based on the earth-based lightning data received from the earth-based lightning detection sensors 110 and/or 115 and/or based on the space-based lightning data received from the space-based lightning detection sensor 105 .
- the server 120 may determine whether multiple optical signals detected by the space-based lightning detection sensor 105 are part of a contiguous group. Specifically, the server 120 may determine whether multiple optical signals detected by the space-based lightning detection sensor 105 occurred with time gaps between each of the optical signals that are equal to or less than a threshold time limit. In some embodiments, the threshold time limit may be equal to or less than 2 ms. In other embodiments, the threshold time limit may be greater than 2 ms. Additionally or alternatively, the server 120 may determine whether the multiple optical signals detected by the space-based lightning detection sensor 105 occurred within a distance of each other that is equal to or less than a threshold distance limit. In some embodiments, the threshold distance limit may be equal to or less than 20 km. In other embodiments, the threshold distance limit may be more than 20 km.
- the space-based lightning detection sensor 105 may detect a first optical signal, a second optical signal, and a third optical signal.
- the first optical signal may be detected and assigned a first time value and a first location
- the second optical signal may be detected and assigned a second time value and a second location. If the difference between the first time value and the second time value is equal to or less than the threshold time limit and the distance between the first location and the second location is equal to or less than the threshold distance limit, the server 120 may determine that the first optical signal and the second optical signal are part of a contiguous group.
- the third optical signal may be detected and assigned a third time value and a third location, and if the difference between the third time value and at least one of the first time value or the second time value is also less than or equal to the threshold time limit and the distance between the third location and at least one of the first location or the second location is less than or equal to the threshold distance limit, the server 120 may determine that the first optical signal, the second optical signal, and the third optical signal are all part of a contiguous group.
- the server 120 may determine that the third optical signal is not a part of the contiguous group.
- the server 120 may generate data indicating which optical signals detected by the space-based lightning detection sensor 105 are part of contiguous groups in the space-based lightning data.
- the server 120 may be configured to determine which lightning pulses are CG strokes and which are cloud pulses based on the earth-based lightning data. For instance, a shape of a plot of a time-varying voltage detected for a lightning pulse, or other information in or derived from earth-based lightning data generated for the lightning pulse, may be used by the server 120 to determine the type of each lightning pulse, e.g., whether each lightning pulse is a CG stroke or a cloud pulse.
- the server 120 may be configured to determine if each of the CG strokes includes or is followed by CC based on the space-based lightning data. For example, the server 120 may determine whether contiguous groups having a time duration have been detected by the space-based lightning detection sensor 105 and if the time duration exceeds a time duration threshold. The time duration may be determined starting from a time assigned to a CG stroke. For example, a CG stroke may be determined to include or be followed by CC if a contiguous group of optical signals associated (or correlated) with the CG stroke is observed that has a duration of at least 8 ms starting from the time assigned to the CG stroke.
- the time duration threshold may be greater or less than 8 ms. Additionally or alternatively, the server 120 may determine that a CG stroke includes or is followed by CC if a contiguous group of optical signals associated (or correlated) with the CG stroke includes at least one optical signal within the time duration following the CG stroke with an intensity that exceeds a threshold intensity. For example, a CG stroke may be determined to include or be followed by CC if the corresponding intensity is greater than or equal to 10 ⁇ 15 J. In other embodiments, the intensity threshold may be greater or less than 10 ⁇ 15 J.
- the time assigned to any given CG stroke may include the time of occurrence of the CG stroke, which may be included in or derived from the earth-based lightning data received from the earth-based lightning detection sensors 110 , 115 .
- the server 120 may determine that a CG stroke includes or is followed by CC if a sum of the intensity of multiple detected optical signals within a contiguous group associated (or correlated) with the CG stroke starting from the time assigned to the CG stroke exceeds an intensity sum threshold. For example, if the sum of the intensity of the detected optical signals in the contiguous group is greater than or equal to 10 ⁇ 14 J, the server 120 may determine that the CG stroke includes or is followed by CC. In other embodiments, the intensity sum threshold may be greater or less than 10 ⁇ 14 J. Additionally or alternatively, the CG stroke may be determined to include or be followed by CC if both the corresponding intensity exceeds the threshold intensity and the corresponding time duration exceeds the threshold duration.
- the server 120 may determine that a CG stroke includes or is followed by CC if an areal extent of any of the detected optical signals within a contiguous group associated (or correlated) with the CG stroke starting from the time assigned to the CG stroke exceeds an areal threshold.
- the CG stroke may be determined to include or be followed by CC if the corresponding areal extent of any of the detected optical signals in the contiguous group is equal to or greater than 200 km 2 .
- the areal threshold may be greater than or less than 200 km 2 .
- the server 120 may determine that a CG stroke includes or is followed by CC if a sum of the areal extents of detected optical signals within a contiguous group associated (or correlated) with the CG stroke starting from the time assigned to the CG stroke exceeds an areal sum threshold. For example, if the sum of the corresponding areal extents is equal to or exceeds 1000 km 2 , the CG stroke may be determined to include or be followed by CC. In other embodiments, the areal sum threshold may be greater than or less than 1000 km 2 .
- the server 120 may determine that a CG stroke includes or is followed by CC if any two or more thresholds are exceeded based on time duration, intensity of one or more detected optical signals, sum of intensity of the detected optical signals, areal extent of one or more detected optical signals, or sum of areal extents of the detected optical signals, observed within a contiguous group associated (or correlated) with the CG stroke starting from the time assigned to the CG stroke.
- the server 120 may execute, perform, or control performance of one or more of the methods or operations described herein.
- the earth-based lightning data may include cloud pulses detected during a period of time following a CG stroke. In some embodiments, the earth-based lightning data may include estimates of altitude of detected cloud pulses. In some embodiments, the server 120 may determine that a CG stroke includes or is followed by CC on the basis of the altitude of one or more cloud pulses detected by the earth-based lightning detection sensor 110 and/or 115 in addition to the space-based lightning data.
- additional space-based data relating to the characteristics of clouds that produce the CG stroke may be available.
- cloud characteristics may include a cloud top altitude, a cloud top temperature, a cloud amount, and whether the cloud top consists primarily of ice crystals or supercooled liquid water droplets.
- space-based cloud characteristics data may be generated by, e.g., the cloud characteristic sensor 140 of FIG. 1 .
- thresholds on the optical signal information detected by the space-based lightning detection sensor 105 may be adjusted dynamically based on one or more of the cloud characteristics.
- the intensity of one or more optical signals within a contiguous group associated (or correlated) with a CG stroke starting from the time assigned to the CG stroke may need to exceed a first intensity threshold of 10 ⁇ 15 J if the cloud top altitude is determined to be at or below a first cloud top altitude threshold and the cloud top is determined to be composed primarily of supercooled liquid water droplets.
- the first cloud top altitude threshold may be equal to or less than five km. In other embodiments, the first cloud top altitude threshold may be greater than five km. In other embodiments, the first intensity threshold may be less than or greater than 10 ⁇ 15 J.
- the intensity of one or more optical signals may need to exceed a different second intensity threshold of 10 ⁇ 14 J if the cloud top altitude is determined to be at or above a second cloud top altitude threshold and the cloud top is determined to be composed primarily of ice crystals.
- the second cloud top altitude threshold may be equal to or greater than ten km. In other embodiments, the second cloud top altitude threshold may be less than ten km. In other embodiments, the second intensity threshold may be less than or greater than 10 ⁇ 14 J.
- the user interface device 125 may include any device that can access data stored at the server 120 such as, for example, a computer, a laptop, a smartphone, a tablet, or other suitable device.
- the user interface device 125 may be used to retrieve and/or present the earth-based lightning data from the earth-based lightning detection sensors 110 and/or 115 , the space-based lightning data from the space-based lightning detection sensor 105 , data that identifies which CG strokes include or are followed by CC, or other measurements and information related to the lightning sources 130 , lightning pulses, and/or optical signals to a user.
- the cloud characteristic sensor 140 may be configured to detect clouds in the environmental space and/or characteristics of the clouds in the environmental space.
- the cloud characteristic sensor 140 may be a space-based sensor (e.g., on a satellite in orbit around the Earth) and may optionally be co-located with the space-based lightning detection sensor 105 .
- the cloud characteristic sensor 140 may be an earth-based sensor.
- the cloud characteristic sensor 140 may output a raw sensor feed to the server 120 which may generate cloud characteristics data from the raw sensor feed. Alternatively or additionally, the cloud characteristic sensor 140 may generate the cloud characteristics data and then send it to the server 120 .
- the cloud characteristics data may include, for a given cloud, one or more of a cloud top altitude, a cloud top temperature, a cloud amount, and whether the cloud top consists primarily of ice crystals or supercooled liquid water droplets.
- FIG. 2 is an example earth-based lightning detection sensor 200 , arranged in accordance with at least one embodiment described herein.
- the earth-based lightning detection sensor 200 may include or correspond to one or more of the earth-based lightning detection sensors 110 and/or 115 of FIG. 1 .
- the earth-based lightning detection sensor 200 may include an antenna 205 , an analog-to-digital converter (ADC) 210 , a processor 215 , a memory 220 , a communication interface 225 , and/or a power supply 230 .
- ADC analog-to-digital converter
- the earth-based lightning detection sensor 200 may, for example, detect lightning pulses emitted by lightning discharges in an environmental space and/or may measure different characteristics of the lightning pulses.
- the earth-based lightning detection sensor 200 may receive and detect at the antenna 205 lightning pulses at one or more of low frequency (LF), very low frequency (VLF), and/or ultra low frequency (ULF).
- LF low frequency
- VLF very low frequency
- ULF ultra low frequency
- LF low frequency
- LF low frequency
- VLF very low frequency
- ULF ultra low frequency
- the earth-based lightning detection sensor 200 may receive and detect at the antenna 205 lightning pulses at other frequencies instead of or in addition to the foregoing range of detection frequencies.
- the detection frequencies may extend at least partially into medium frequency (MF) (300 kHz to 3 MHz).
- MF medium frequency
- the antenna 205 may output, for each detected lightning pulse, an analog signal that represents the lightning pulse.
- the ADC 210 may convert the received analog signal for each lightning pulse into a digital signal or digital data.
- the digital signal or digital data may include a digital representation of the lightning pulse.
- the digital signal or digital data may be stored by the processor 215 in the memory 220 .
- the digital signal or digital data for example, may be communicated to an external device, such as the server 120 , via the communication interface 225 , as earth-based lightning data.
- the processor 215 may process the digital signal or digital data to determine a type of the associated lightning pulse.
- the processor 215 may include one or more components of computational system 400 .
- the processor 215 may include one or more servers located in one or more locations and/or located at various distributed locations. Although the processing of the earth-based lightning data, and in particular the digital signal or digital data, to determine a type of the associated lightning pulse is described as being performed by the processor 215 at the earth-based lightning detection sensor 200 , in other embodiments, the processing may be performed remotely, e.g., at the server 120 of FIG. 1 .
- the processor 215 may more generally include any suitable processing device, such as a processor, a microprocessor, a controller, a microcontroller, a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a digital signal processor (DSP), or other suitable processing device.
- a processor such as a processor, a microprocessor, a controller, a microcontroller, a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a digital signal processor (DSP), or other suitable processing device.
- FPGA field programmable gate array
- ASIC application specific integrated circuit
- DSP digital signal processor
- the memory 220 may include a disk drive, a drive array, an optical storage device, a solid-state storage device, such as random access memory (“RAM”) and/or read-only memory (“ROM”), which can be programmable, flash-updateable, and/or the like.
- RAM random access memory
- ROM read-only memory
- the communication interface 225 may include a modem, a network card (wireless or wired), an infrared communication device, a wireless communication device, and/or a wireless communication chipset.
- the communication interface 225 may communicate with a wireless network such as, for example, a wireless LAN, a cellular network, a LTE network, a CDMA network, a GSM network, a microwave network, a long range Wi-Fi network, a satellite network, and/or other suitable network.
- the communication interface 225 may transmit data such as, for example, earth-based lightning data, to the server 120 (or another device) via the network 135 (or other network).
- the earth-based lightning detection sensor 200 may be mounted on a concrete ground pad, while in other embodiments, the earth-based lightning detection sensor 200 may also include non-ground mounting options.
- the earth-based lightning detection sensor 200 may be used to perform and/or control operation of one or more of the methods or operations of the embodiments described herein. For example, the earth-based lightning detection sensor 200 may be used to perform any calculation, solve any equation, perform any identification, and/or make any determination described herein.
- the earth-based lightning detection sensor 200 may include either a DC power supply 230 or an AC power supply 230 .
- Some embodiments described herein relate to methods to determine whether CG strokes include or are followed by CC. This and other methods and/or embodiments thereof may be implemented individually and/or in any combination of two or more.
- FIG. 3 is a flowchart of an example method 300 to identify CG strokes that include or are followed by CC, arranged in accordance with at least one embodiment described herein.
- the method 300 may be performed, in whole or in part, in the system 100 of FIG. 1 , the earth-based lightning detection sensor 200 of FIG. 2 , the space-based lightning detection sensor 105 of FIG. 1 , and/or in other systems, devices, and/or configurations.
- some or all of the method 300 may be controlled by a computer or processor device, such as the server 120 of FIG. 1 , the processor 215 of FIG. 2 , and/or the computational system 400 of FIG. 4 .
- the method 300 may include one or more of blocks 302 , 304 , 306 , 308 , 310 , 312 , 314 , and/or 316 .
- the method 300 may begin at block 302 .
- one or more lightning pulses may be detected in an environmental space over a period of time using multiple earth-based lightning detection sensors, such as any of the earth-based lightning detection sensors 110 , 115 , 200 of FIG. 1 or FIG. 2 .
- the lightning pulses may be detected by, e.g., the antenna 205 of FIG. 2 generating an analog signal representative of each lightning pulse received at the antenna 205 .
- Block 302 may be followed by block 306 .
- earth-based lightning data may be generated for each of the lightning pulses detected in the environmental space using the earth-based lightning detection sensors.
- the earth-based lightning data may include one or more of a geolocation of each lightning pulse, a time of occurrence of each lightning pulse, an estimate of the maximum current associated with each lightning pulse, and/or features of the time-varying voltage of each lightning pulse, such as a duration (e.g., length of time) of each lightning pulse.
- the earth-based lightning data may be generated by the server 120 of FIG. 1 or the processor 215 of FIG. 2 from data output by two or more of the earth-based lightning detection sensors 110 and/or 115 of FIG. 1 and/or output by the ADC 210 of FIG. 2 .
- Block 306 may be followed by block 310 .
- Block 310 it may be determined whether each of the lightning pulses is a CG stroke or a cloud pulse.
- Block 310 may include determining that at least one of the lightning pulses is a CG stroke.
- the lightning pulses may be determined as CG strokes or cloud pulses based on the earth-based lightning data.
- the earth-based lightning data detected for each lightning pulse may include a time-varying voltage and a shape of a plot of the time-varying voltage, or other information in or derived from the earth-based lightning data for a given lightning pulse, that may be used to determine whether each lightning pulse is a cloud pulse or a CG stroke.
- Block 310 may be followed by block 312 .
- block 304 and/or block 308 may be performed in parallel with one or more of blocks 302 , 306 , and/or 310 .
- one or more optical signals may be detected in the environmental space over the period of time using one or more space-based lightning detection sensors, such as the space-based lightning detection sensor 105 of FIG. 1 .
- detecting optical signals using one or more space-based lightning detection sensors may include detecting optical signals or other light emitted by the lightning pulses.
- Block 304 may be followed by block 308 .
- space-based lightning data may be generated for each of the optical signals detected in the environmental space using the one or more space-based lightning detection sensors.
- the space-based lightning data may include one or more of a geolocation of each optical signal, an intensity of each optical signal, an area of each optical signal, a time of occurrence of each optical signal, and/or a duration (e.g., length of time) of each optical signal.
- the space-based lightning data may be generated by the space-based lightning detection sensor 105 of FIG. 1 and may be transmitted to and received by the server 120 of FIG. 1 .
- the server 120 may analyze the space-based lightning data and determine one or more contiguous groups, e.g., by assigning optical signals identified in the space-based lightning data into contiguous groups of optical signals according to any suitable algorithm, such as the algorithm described above.
- the one or more contiguous groups may be defined by and/or included in the space-based lightning data received by the server 120 from the space-based lightning detection sensor 105 .
- Block 308 may be followed by block 312 .
- blocks 314 and/or 316 may be performed in parallel with one or more of blocks 302 , 304 , 306 , 308 , and/or 310 .
- cloud characteristics may be detected.
- the cloud characteristics may be detected for clouds associated with the lightning pulses and/or the optical signals.
- the cloud characteristics may be detected for clouds associated with lightning pulses that are determined to be CG strokes.
- the cloud characteristics may be detected by one or more sensors co-located with the space-based lightning detection sensor.
- the cloud characteristics may be detected by the cloud characteristic sensor 140 of FIG. 1 and/or by one or more sensors co-located with the space-based lightning detection sensor 105 of FIG. 1 .
- Block 314 may be followed by block 316 .
- cloud characteristics data may be generated.
- the cloud characteristics data may be generated for the clouds associated with the lightning pulses and/or the optical signals.
- the cloud characteristics data may include one or more of a cloud top altitude, a cloud top temperature, a cloud amount, and whether the cloud top consists primarily of ice crystals or supercooled liquid water droplets.
- Block 316 may be followed by block 312 .
- each CG stroke determined at block 310 it may be determined whether the CG stroke includes or is followed by CC.
- the determination of whether each CG stroke includes or is followed by CC may be based on the space-based lightning data generated at block 308 . For instance, a given CG stroke may be determined to include or be followed by CC based on the space-based lightning data as described above.
- the method 300 may further include a step to correlate lightning pulses represented in the earth-based lightning data with optical signals represented in the space-based lightning data, e.g., prior to block 312 .
- the lightning pulses and/or optical signals represented in the different types of lightning data may be correlated based on one or more of geolocation, time of occurrence, duration, and/or other potentially identifying features of the lightning pulses and/or optical signals.
- each of the CG strokes determined at block 310 from the earth-based lightning data may have a geolocation, time of occurrence, and/or duration included in the earth-based lightning data.
- any combination of the geolocation, time of occurrence, and/or duration may serve as a signature or fingerprint for the CG stroke.
- each of the optical signals represented in the space-based lightning data and/or each contiguous group of optical signals may have a geolocation, time of occurrence, and/or duration included in the space-based lightning data.
- any combination of the geolocation, time of occurrence, and/or duration may serve as a signature or fingerprint.
- the lightning pulses, including the CG strokes, represented in the earth-based lightning data may be correlated with the optical signals represented in the space-based lightning data and/or contiguous groups of optical signals by comparing the signatures or fingerprints of each. If the signature or fingerprint of a CG stroke represented in the earth-based lightning data matches, or is at least consistent with, the signature or fingerprint of an optical signal represented in the space-based lightning data or of a contiguous group of optical signals, the CG stroke represented in the earth-based lightning data may be determined to be the same as and thereby associated with, or may at a minimum be correlated with, the corresponding optical signal represented in the space-based lightning data or the corresponding contiguous group of optical signals.
- the intensity, duration, and/or other data of the optical signal in the space-based lightning data or of the contiguous group of optical signals may be used at block 312 to determine if the corresponding CG stroke in the earth-based lightning data includes or is followed by CC.
- One or more outputs of the method 300 to determine whether CG strokes include or are followed by CC may be used to generate a warning about a potential fire. For instance, the method 300 may determine that a CG stroke includes or is followed by CC and may notify a fire department or public officials located near the CG stroke to warn of a possible fire due to the CC included in or following the CG stroke.
- FIG. 4 includes a block diagram of an example computational system 400 (or processing unit), arranged in accordance with at least one embodiment described herein.
- the computational system 400 may be used to perform and/or control operation of any of the embodiments described herein.
- the computational system 400 may be used alone or in conjunction with other components.
- the computational system 400 may be used to perform any calculation, solve any equation, perform any identification, and/or make any determination described herein.
- the computational system 400 is an example implementation of the server 120 of FIG. 1 .
- the computational system 400 may include any or all of the hardware elements shown in FIG. 4 and described herein.
- the computational system 400 may include hardware elements that may be electrically coupled via a bus 405 (or may otherwise be in communication, as appropriate).
- the hardware elements may include one or more processors 410 , including one or more general-purpose processors and/or one or more special-purpose processors (such as digital signal processing chips, graphics acceleration chips, and/or other suitable processors); one or more input devices 415 , which may include a mouse, a keyboard, or other suitable input device; and one or more output devices 420 , which may include a display device, a printer, and/or other suitable output devices.
- the computational system 400 may further include (and/or be in communication with) one or more storage devices 425 , which may include local and/or network-accessible storage, a disk drive, a drive array, an optical storage device, a solid-state storage device, such as a RAM, and/or ROM, which may be programmable, flash-updateable, and/or the like.
- the computational system 400 might also include a communication subsystem 430 , which may include a modem, a network card (wireless or wired), an infrared communication device, a wireless communication device, and/or chipset (such as a Bluetooth® device, a 802.6 device, a Wi-Fi device, a WiMAX device, cellular communication facilities, etc.), and/or the like.
- the communication subsystem 430 may permit data to be exchanged with a network (such as the networks described herein) and/or any other systems and/or devices described herein.
- the computational system 400 may further include a working memory 435 , which may include a RAM or ROM device, as described above.
- the computational system 400 may also include software elements, which may be located within the working memory 435 .
- the computational system 400 may include an operating system 440 and/or other code, such as one or more application programs 445 , which may include computer programs, and/or may be designed to implement the methods, and/or configure the systems, as described herein.
- one or more operations or procedures described with respect to the method(s) discussed above might be implemented as code and/or instructions executable by a computer (and/or a processor within a computer).
- a set of these instructions and/or codes may be stored on a computer-readable storage medium, such as the storage device(s) 425 described above.
- the storage medium may be incorporated within the computational system 400 or in communication with the computational system 400 .
- the storage medium might be separate from the computational system 400 (e.g., a removable medium, such as a compact disc, etc.), and/or provided in an installation package, such that the storage medium may be used to program a general-purpose computer with instructions/code stored thereon.
- These instructions may take the form of executable code, which may be executable by the computational system 400 and/or may take the form of source and/or installable code, which, upon compilation and/or installation on the computational system 400 (e.g., using any of a variety of generally available compilers, installation programs, compression/decompression utilities, etc.), takes the form of executable code.
- a computing device can include any suitable arrangement of components that provides a result conditioned on one or more inputs.
- Suitable computing devices include multipurpose microprocessor-based computer systems accessing stored software that programs or configures the computing system from a general-purpose computing apparatus to a specialized computing apparatus implementing one or more embodiments of the present subject matter. Any suitable programming, scripting, or other type of language or combinations of languages may be used to implement the teachings contained herein in software to be used in programming or configuring a computing device.
- Embodiments of the methods disclosed herein may be performed in the operation of such computing devices.
- the order of the blocks presented in the examples above can be varied—for example, blocks can be re-ordered, combined, and/or broken into sub-blocks. Certain blocks or processes can be performed in parallel.
Landscapes
- Environmental & Geological Engineering (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Atmospheric Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Ecology (AREA)
- Environmental Sciences (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
Description
Claims (20)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15/848,674 US10746772B2 (en) | 2017-12-20 | 2017-12-20 | Identification of cloud-to-ground lightning strokes with continuing current |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15/848,674 US10746772B2 (en) | 2017-12-20 | 2017-12-20 | Identification of cloud-to-ground lightning strokes with continuing current |
Publications (2)
Publication Number | Publication Date |
---|---|
US20190187197A1 US20190187197A1 (en) | 2019-06-20 |
US10746772B2 true US10746772B2 (en) | 2020-08-18 |
Family
ID=66815913
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US15/848,674 Active 2038-08-21 US10746772B2 (en) | 2017-12-20 | 2017-12-20 | Identification of cloud-to-ground lightning strokes with continuing current |
Country Status (1)
Country | Link |
---|---|
US (1) | US10746772B2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11043796B2 (en) | 2019-05-02 | 2021-06-22 | Vaisala, Inc. | Quantification of charge transfer in continuing current lightning events |
US20230011424A1 (en) * | 2021-07-05 | 2023-01-12 | Helios Pompano, Inc. | System and method for detecting high-risk lightning strikes for use in predicting and identifying wildfire ignition locations |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080122424A1 (en) * | 2005-01-24 | 2008-05-29 | Yongming Zhang | Integrated Sensor System Monitoring and Characterizing Lightning Events |
US20080262732A1 (en) * | 2007-04-17 | 2008-10-23 | Toa Systems, Inc. | Method of detecting, locating, and classifying lightning |
US20160018563A1 (en) * | 2014-07-16 | 2016-01-21 | Accuweather, Inc. | Lightning detection system, method and device |
US20180321422A1 (en) * | 2017-05-02 | 2018-11-08 | Earth Networks, Inc. | System and method for satellite optical ground radio hybrid lightning location |
-
2017
- 2017-12-20 US US15/848,674 patent/US10746772B2/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080122424A1 (en) * | 2005-01-24 | 2008-05-29 | Yongming Zhang | Integrated Sensor System Monitoring and Characterizing Lightning Events |
US20080262732A1 (en) * | 2007-04-17 | 2008-10-23 | Toa Systems, Inc. | Method of detecting, locating, and classifying lightning |
US20160018563A1 (en) * | 2014-07-16 | 2016-01-21 | Accuweather, Inc. | Lightning detection system, method and device |
US20180321422A1 (en) * | 2017-05-02 | 2018-11-08 | Earth Networks, Inc. | System and method for satellite optical ground radio hybrid lightning location |
Non-Patent Citations (8)
Title |
---|
Bitzer, P. M. (2017), Global distribution and properties of continuing current in lightning, J. Geophys. Res. Atmos., 122, 1033-1041, doi:10.1002/2016JD025532, 9 pages. |
Cummer, S. A., & Lyons, W. A. (2004). Lightning charge moment changes in US High Plains thunderstorms. Geophysical research letters, 31(5), 4 pages. |
D. Mach, et al., Performance assessment of the optical transient detector and lightning imaging sensor, Journal of Geophysical Research, (2007), 16 pages. |
Geostationary Lightning Mapper (GLM) GOES-R series Fact Sheet ; www.goes-r.gov/spacesegment/glm.html. * |
https://www.goes-r.gov/spacesegment/glm.html (The Geostationary Lightning Mapper). * |
Lu, G., Cummer, S. A., Blakeslee, R. J., Weiss, S., & Beasley, W. H. (2012). Lightning morphology and impulse charge moment change of high peak current negative strokes. Journal of Geophysical Research: Atmospheres, 117(D4), 16 pages. |
M.J. Murphy et al., Cloud Lightning Performance and Climatology of the U.S. Based on the Upgraded U.S. National Lightning Detection Network, Seventh Conf. on Meteorological Applications of Lightning Data, Amer. Meteorol. Soc. (2015), 11 pages. |
NSSL_The National Severe Storms Laboratory; www.nssl.noaa.gov. * |
Also Published As
Publication number | Publication date |
---|---|
US20190187197A1 (en) | 2019-06-20 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US11043796B2 (en) | Quantification of charge transfer in continuing current lightning events | |
Pohjola et al. | The comparison of GLD360 and EUCLID lightning location systems in Europe | |
Smith et al. | A distinct class of isolated intracloud lightning discharges and their associated radio emissions | |
EP3276382A1 (en) | Short-term thunderstorm forecast and severe weather alert system and method | |
Betz et al. | LINET—An international lightning detection network in Europe | |
CN102095943B (en) | Early warning method and device of lightning | |
US20130156258A1 (en) | Thermal powerline rating and clearance analysis using thermal imaging technology | |
Schumann et al. | Electric fields changes produced by positives cloud-to-ground lightning flashes | |
López et al. | Spatio-temporal dimension of lightning flashes based on three-dimensional Lightning Mapping Array | |
US10746772B2 (en) | Identification of cloud-to-ground lightning strokes with continuing current | |
Leal et al. | Compact intracloud discharges: New classification of field waveforms and identification by lightning locating systems | |
Defer et al. | An overview of the lightning and atmospheric electricity observations collected in southern France during the HYdrological cycle in Mediterranean EXperiment (HyMeX), Special Observation Period 1 | |
US20230011424A1 (en) | System and method for detecting high-risk lightning strikes for use in predicting and identifying wildfire ignition locations | |
Schulz et al. | Validation of the EUCLID LLS during HyMeX SOP1 | |
Montanyà et al. | Potential use of space-based lightning detection in electric power systems | |
Harkema et al. | Geostationary Lightning Mapper flash characteristics of electrified snowfall events | |
Guha et al. | Lightning detection and warning | |
EP3709055B1 (en) | Determination of lightning discharge polarity | |
NL2024773B1 (en) | Method and System for Locating a Light Source | |
Nag et al. | Lightning locating systems: Characteristics and validation techniques | |
JP2001004731A (en) | Broad-band interferometer | |
Naccarato et al. | Evaluation of BrasilDAT relative detection efficiency based on LIS observations and a numeric model | |
Mehranzamir et al. | Hardware installation of lightning locating system using time difference of arrival method | |
CN114034936A (en) | Lightning positioning system and method based on distributed monitoring sites | |
de Jesús Pérez-Pérez et al. | Experimental detection efficiency evaluation for a lightning location system on a mountainous region |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
FEPP | Fee payment procedure |
Free format text: ENTITY STATUS SET TO UNDISCOUNTED (ORIGINAL EVENT CODE: BIG.); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: DOCKETED NEW CASE - READY FOR EXAMINATION |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: NON FINAL ACTION MAILED |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: RESPONSE TO NON-FINAL OFFICE ACTION ENTERED AND FORWARDED TO EXAMINER |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: NOTICE OF ALLOWANCE MAILED -- APPLICATION RECEIVED IN OFFICE OF PUBLICATIONS |
|
AS | Assignment |
Owner name: VAISALA, INC., COLORADO Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MURPHY, MARTIN J.;SAID, RYAN K.;REEL/FRAME:052518/0771 Effective date: 20171220 |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: PUBLICATIONS -- ISSUE FEE PAYMENT VERIFIED |
|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
MAFP | Maintenance fee payment |
Free format text: PAYMENT OF MAINTENANCE FEE, 4TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1551); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY Year of fee payment: 4 |